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40                                        FLORA   INDICA.

1.  As regards specific centres, we proceed in our investiga-
tions on the assumption that all the individuals of a unisexual
plant proceeded from one oiiginally created parent, and all of
a bisexual from a single pair.    To discuss this subject would
be out of place here : for a rfeumt of the principal facts op-
posed to it, as well as of those which support it,, we muwt re-
fer our readers to Sir Charles Lyell'a c Principles of (Jeology/
and to the Introductory Essay to the Flora of Now Zealand.
It is sufficient for our present purpose to declare, that after
many years' unprejudiced careful consideration of the subject
in all its bearings, during which period we have been fettered
by no professed opinion to support, and have had no inculcated
theory to eradicate, we have "Been independently led to this
conclusion, as being most consonant with our very consider-
able experience in the field and herbarium 

2.  In attributing the present dispersion to natural causes,
we by no means limit them to existing ones.    We have every
reason to believe that many living Hpecics of plants have, sur-
vived the destruction of large continents, just as many animals
have ; that in short they have outlived recent geological Changes,
of whatever magnitude, that they have witnessed gradual but
complete revolutions in the relative positions of land and sea,
and consequently in the climate of the several parts of the
globe.    Such an antiquity is proved for shells especially, and
to a greater or less degree for all tribe* of the animal king-
dom; the amount of evidence dejxwdmg solely on the? adap-
tation of their* dead parts to preservation iti a mtoguwable,
condition.  Fossil plants arc specifically juivcr thus to be iden-
tified, and our argument is hence one founded on anub&y only,
but supported by many faete* in distribution, not lens than by
the effects of sueh operations as we now see in

* Sir Charles Lyoll vas the first to appreciate thb wot imjwrffmt ult.
await in geographical distribution (Principle* of Geology, olwp, xxxuL) j nnd
3?rofe$60* Edward Forbw first brought it to boar upon an rateting i'Yuna ftucl
3?ka, in his admirable Kay on tlio * Distribution of the Plant* and Animal* of
the British -Islaacls' (in the Isfc ?oL of Mom, Cfeolo^ Survey of V. .), W*